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SPL(Structured Process Language) A programming language specially for structured data computing.
package com.scudata.dw;
import java.io.*;
import java.math.*;
import com.scudata.common.DateCache;
import com.scudata.common.ObjectCache;
import com.scudata.dm.DataStruct;
import com.scudata.dm.Record;
import com.scudata.dm.Sequence;
import com.scudata.dm.SerialBytes;
import com.scudata.dm.Table;
/**
* ?д?ʱ?Ķ?ȡ??????
* @author runqian
*
*/
public class RowBufferReader {
private StructManager structManager;
private byte[] buffer; // ÿ?ζ?????ֽڻ???
private int index; // ??һ?ֽ???buffer?е?????
private int count; // ????buffer??ʵ???ֽ???Ŀ
private byte[] readBuffer = new byte[32];
private char[] charBuffer = new char[128];
private static final String[] HEXSTRINGS = new String[] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A",
"B", "C", "D", "E", "F" };
private static final Long LONG0 = new Long(0);
private static final Double FLOAT0 = new Double(0);
private static final BigDecimal DECIMAL0 = new BigDecimal(BigInteger.ZERO);
private static final Integer[] INT15 = new Integer[] { new Integer(0), new Integer(1), new Integer(2),
new Integer(3), new Integer(4), new Integer(5), new Integer(6), new Integer(7), new Integer(8),
new Integer(9), new Integer(10), new Integer(11), new Integer(12), new Integer(13), new Integer(14),
new Integer(15) };
private static final Object NONE = new Object();
public RowBufferReader(StructManager structManager, byte[] buffer) {
this.structManager = structManager;
this.buffer = buffer;
this.count = buffer.length;
}
public RowBufferReader(StructManager structManager, byte[] buffer, int index, int count) {
this.structManager = structManager;
this.buffer = buffer;
this.index = index;
this.count = count;
}
/**
* ???ص?ǰ??ȡλ??
* @return
*/
public long position() {
return index;
}
/**
* ????n?ֽ?,????n?ֽھ?????ĩβ
* @param n
* @throws IOException
*/
public void skipFully(int n) throws IOException {
int total = count - index;
if (total >= n) {
index += n;
} else {
index = count;
throw new EOFException();
}
}
/**
* ????n?ֽ?
* @param n
* @throws IOException
*/
public int skipBytes(int n) throws IOException {
if (n < 1) return 0;
int total = count - index;
if (total >= n) {
index += n;
return n;
} else {
index = count;
return total;
}
}
/**
* ????n?ֽ?
* @param n
* @throws IOException
*/
public long skip(long n) throws IOException {
if (n < 1) return 0;
long total = count - index;
if (total >= n) {
index += (int)n;
return n;
} else {
index = count;
return total;
}
}
/**
* ?Ƿ??????ݿɶ?
* @return
* @throws IOException
*/
public boolean hasNext() throws IOException {
return count > index;
}
/**
* ʣ??ɶ????ݳ???
* @return
* @throws IOException
*/
public int available() throws IOException {
return count - index;
}
/**
* ???ã???????ͷλ??
*/
public void reset() {
index = 0;
}
/**
* ????ĩβλ??
*/
public void close() throws IOException {
index = count;
}
public boolean readBoolean() throws IOException {
return buffer[index++] != 0;
}
public int read() throws IOException {
return buffer[index++] & 0xff;
}
private int read2() throws IOException {
return buffer[index++] & 0xff;
}
/**
* ??ȡ??????b??????????ij???
* @param b
* @return
* @throws IOException
*/
public int read(byte []b) throws IOException {
return read(b, 0, b.length);
}
/**
* ??ȡ??????b??????ָ????ƫ?ƺͳ???
* @param b
* @param off
* @param len
* @return
* @throws IOException
*/
public int read(byte []b, int off, int len) throws IOException {
int total = count - index;
if (total >= len) {
System.arraycopy(buffer, index, b, off, len);
index += len;
return len;
} else if (total > 0) {
System.arraycopy(buffer, index, b, off, total);
index = count;
return total;
} else {
return -1;
}
}
/**
* ??ȡ??????b??????ĩβ
* @param b
*/
public void readFully(byte []b) throws IOException {
if (read(b, 0, b.length) != b.length) {
throw new EOFException();
}
}
public void readFully(byte []b, int off, int len) throws IOException {
if (read(b, off, len) != len) {
throw new EOFException();
}
}
/**
* ??ȡһ???ֽ?
* @return
* @throws IOException
*/
public byte readByte() throws IOException {
return buffer[index++];
}
/**
* ??ȡһ???????ֽ?
* @return
* @throws IOException
*/
public int readUnsignedByte() throws IOException {
return buffer[index++] & 0xff;
}
/**
* ??ȡһ??short
* @return
* @throws IOException
*/
public short readShort() throws IOException {
int ch1 = buffer[index++] << 8;
return (short)(ch1 + (buffer[index++] & 0xff));
}
/**
* ??ȡһ??????short
* @return
* @throws IOException
*/
public int readUnsignedShort() throws IOException {
int ch1 = (buffer[index++] & 0xff) << 8;
return ch1 + (buffer[index++] & 0xff);
}
public char readChar() throws IOException {
int ch1 = buffer[index++] << 8;
return (char)(ch1 + (buffer[index++] & 0xff));
}
public float readFloat() throws IOException {
return Float.intBitsToFloat(readInt());
}
public double readDouble() throws IOException {
int b = read2();
if (b == BufferWriter.FLOAT16) {
int n = readUInt16();
int scale = n >>> 14; // ????λ??С??λ??
n &= 0x3FFF;
if (scale == 0) {
return n;
} else if (scale == 1) {
return n / 100.0;
} else if (scale == 2) {
return n / 10000.0;
} else {
return n * 100;
}
} else if (b == BufferWriter.FLOAT32) {
int n = readInt32();
int scale = n >>> 30; // ????λ??С??λ??
n &= 0x3FFFFFFF;
if (scale == 0) {
return n;
} else if (scale == 1) {
return n / 100.0;
} else if (scale == 2) {
return n / 10000.0;
} else {
return n * 100.0;
}
} else {
return Double.longBitsToDouble(readLong64());
}
}
public String readLine() throws IOException {
throw new IOException("readLine not supported");
}
public String readUTF() throws IOException {
return readString();
}
public byte[] readByteArray() throws IOException {
int len = readInt();
if (len < 0) {
return null;
} else {
byte[] buf = new byte[len];
readFully(buf, 0, len);
return buf;
}
}
public String[] readStrings() throws IOException {
int len = readInt();
if (len < 0) {
return null;
} else {
String[] strs = new String[len];
for (int i = 0; i < len; ++i) {
strs[i] = readString();
}
return strs;
}
}
public String readString() throws IOException {
int b = read2();
if (b == BufferWriter.NULL) {
return null;
}
int t1 = b & 0xF0;
if (t1 == BufferWriter.STRING4 || t1 == BufferWriter.STRING5) {
return readString(b & 0x1F);
} else if (t1 == BufferWriter.DIGIT4) {
return readDigits(b & 0x0F);
} else if (t1 == BufferWriter.HEX4) {
return HEXSTRINGS[b & 0x0F];
} else {
int n = readInt();
return readString(n);
}
}
/**
* ??ȡ??????ɵ??ַ???
* @param size ????
* @return
* @throws IOException
*/
private String readDigits(int size) throws IOException {
byte[] readBuffer = this.readBuffer;
readFully(readBuffer, 0, size);
int b = readBuffer[size - 1] & 0xFF;
int low = b & 0x0F;
char []chars;
if (low > 9) {
int len = 2 * size - 1;
chars = new char[len];
chars[len - 1] = (char)('0' + (b >>> 4));
} else {
int len = 2 * size;
chars = new char[len];
chars[len - 2] = (char)('0' + (b >>> 4));
chars[len - 1] = (char)('0' + low);
}
--size;
for (int i = 0, q = 0; i < size; ++i) {
b = readBuffer[i] & 0xFF;
chars[q++] = (char)('0' + (b >>> 4));
chars[q++] = (char)('0' + (b & 0x0F));
}
return new String(chars);
}
private String readString(int size) throws IOException {
if (size == 0) return "";
char []charBuffer = this.charBuffer;
if (size > charBuffer.length) {
charBuffer = new char[size];
this.charBuffer = charBuffer;
}
int seq = 0;
int c, char2, char3;
byte []bytearr;
int i = 0;
if (count - index >= size) {
bytearr = this.buffer;
i = index;
this.index += size;
size += i;
} else {
bytearr = new byte[size];
readFully(bytearr, 0, size);
}
while (i < size) {
c = (int)bytearr[i] & 0xff;
switch (c >> 4) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
/* 0xxx xxxx*/
i++;
charBuffer[seq++] = (char)c;
break;
case 12:
case 13:
/* 110x xxxx 10xx xxxx*/
i += 2;
if (i > size)
throw new UTFDataFormatException();
char2 = (int)bytearr[i - 1];
if ((char2 & 0xC0) != 0x80)
throw new UTFDataFormatException();
charBuffer[seq++] = (char)(((c & 0x1F) << 6) | (char2 & 0x3F));
break;
case 14:
/* 1110 xxxx 10xx xxxx 10xx xxxx */
i += 3;
if (i > size)
throw new UTFDataFormatException();
char2 = (int)bytearr[i - 2];
char3 = (int)bytearr[i - 1];
if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80))
throw new UTFDataFormatException();
charBuffer[seq++] = (char)(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0));
break;
default:
/* 10xx xxxx, 1111 xxxx */
throw new UTFDataFormatException();
}
}
// The number of chars produced may be less than utflen
return new String(charBuffer, 0, seq);
}
public long readLong() throws IOException {
int b = read2();
if (b == BufferWriter.LONG0) {
return 0;
} else if (b == BufferWriter.LONG16) {
return readUInt16();
} else if (b == BufferWriter.LONG32) {
return readInt32();
} else {
return readLong64();
}
}
public int readInt() throws IOException {
int b = read2();
if (b == BufferWriter.INT16) {
return readUInt16();
} else if (b == BufferWriter.INT32) {
return readInt32();
} else if ((b & 0xF0) == BufferWriter.INT12) {
return ((b & 0x0F) << 8) + read2();
} else { // INT4
return b & 0x0F;
}
}
private int readUInt16() throws IOException {
int n = ((buffer[index] & 0xFF) << 8) + (buffer[index + 1] & 0xFF);
index += 2;
return n;
}
private int readUInt24() throws IOException {
byte []data = this.buffer;
int index = this.index;
this.index += 3;
return ((data[index] & 0xff) << 16) +
((data[index + 1] & 0xff) << 8) + (data[index + 2] & 0xff);
}
public int readInt32() throws IOException {
byte []data = this.buffer;
int index = this.index;
this.index += 4;
return (data[index] << 24) + ((data[index + 1] & 0xff) << 16) +
((data[index + 2] & 0xff) << 8) + (data[index + 3] & 0xff);
}
private long readULong32() throws IOException {
byte []data = this.buffer;
int index = this.index;
this.index += 4;
return ((long)(data[index] & 0xff) << 24) + ((data[index + 1] & 0xff) << 16) +
((data[index + 2] & 0xff) << 8) + (data[index + 3] & 0xff);
}
/**
* ??ȡ5?ֽڱ?ʾlong
* @return
* @throws IOException
*/
public long readLong40() throws IOException {
byte []data = this.buffer;
int index = this.index;
this.index += 5;
return (((long)(data[index] & 0xff) << 32) +
((long)(data[index + 1] & 0xff) << 24) +
((data[index + 2] & 0xff) << 16) +
((data[index + 3] & 0xff) << 8) +
(data[index + 4] & 0xff));
}
/**
* ??ȡ6?ֽڱ?ʾlong
* @return
* @throws IOException
*/
public long readLong48() throws IOException {
byte []data = this.buffer;
int index = this.index;
this.index += 6;
return (((long)(data[index] & 0xff) << 40) +
((long)(data[index + 1] & 0xff) << 32) +
((long)(data[index + 2] & 0xff) << 24) +
((data[index + 3] & 0xff) << 16) +
((data[index + 4] & 0xff) << 8) +
(data[index + 5] & 0xff));
}
public long readLong64() throws IOException {
byte []data = this.buffer;
int index = this.index;
this.index += 8;
return (((long)data[index] << 56) +
((long)(data[index + 1] & 0xff) << 48) +
((long)(data[index + 2] & 0xff) << 40) +
((long)(data[index + 3] & 0xff) << 32) +
((long)(data[index + 4] & 0xff) << 24) +
((data[index + 5] & 0xff) << 16) +
((data[index + 6] & 0xff) << 8) +
(data[index + 7] & 0xff));
}
private Object readMark0(int b) throws IOException {
switch (b) {
case BufferWriter.NULL:
return null;
case BufferWriter.FLOAT0:
return FLOAT0;
case BufferWriter.DECIMAL0:
return DECIMAL0;
case BufferWriter.LONG0:
return LONG0;
case BufferWriter.TRUE:
return Boolean.TRUE;
case BufferWriter.FALSE:
return Boolean.FALSE;
default: // none
return NONE;
}
}
private Object readMark1(int b) throws IOException {
switch (b) {
case BufferWriter.INT16:
return ObjectCache.getInteger(readUInt16());
case BufferWriter.INT32:
return new Integer(readInt32());
case BufferWriter.FLOAT16:
int n = readUInt16();
switch (n >>> 14) {
case 0:
return new Double(n & 0x3FFF);
case 1:
return new Double((n & 0x3FFF) / 100.0);
case 2:
return new Double((n & 0x3FFF) / 10000.0);
default:
return new Double((n & 0x3FFF) * 100);
}
case BufferWriter.FLOAT32:
n = readInt32();
switch (n >>> 30) {
case 0:
return new Double(n & 0x3FFFFFFF);
case 1:
return new Double((n & 0x3FFFFFFF) / 100.0);
case 2:
return new Double((n & 0x3FFFFFFF) / 10000.0);
default:
return new Double((n & 0x3FFFFFFF) * 100);
}
case BufferWriter.FLOAT64:
return new Double(Double.longBitsToDouble(readLong64()));
case BufferWriter.LONG16:
return new Long(readUInt16());
case BufferWriter.LONG32:
return new Long(readInt32());
default:
return new Long(readLong64());
}
}
private void skipMark1(int b) throws IOException {
switch (b) {
case BufferWriter.INT16:
case BufferWriter.FLOAT16:
case BufferWriter.LONG16:
skipFully(2);
break;
case BufferWriter.INT32:
case BufferWriter.FLOAT32:
case BufferWriter.LONG32:
skipFully(4);
break;
default: // FLOAT64 LONG64
skipFully(8);
}
}
private Object readMark2(int b) throws IOException {
switch (b) {
case BufferWriter.STRING:
return readString(readInt());
case BufferWriter.DECIMAL:
int scale = read2();
int len = read2();
byte[] buf = new byte[len];
readFully(buf, 0, len);
return new BigDecimal(new BigInteger(buf), scale);
case BufferWriter.SEQUENCE:
len = readInt();
Sequence seq = new Sequence(len);
for (int i = 0; i < len; ++i) {
seq.add(readObject());
}
return seq;
case BufferWriter.TABLE:
return readTable();
case BufferWriter.RECORD:
return readRecord();
default: // BLOB
return readByteArray();
}
}
private void skipMark2(int b) throws IOException {
switch (b) {
case BufferWriter.STRING:
skipFully(readInt());
break;
case BufferWriter.DECIMAL:
skipFully(1);
skipFully(read2());
break;
case BufferWriter.SEQUENCE:
int len = readInt();
for (int i = 0; i < len; ++i) {
skipObject();
}
break;
case BufferWriter.TABLE:
skipTable();
break;
default: // BLOB
int n = readInt();
if (n > 0) skipFully(n);
}
}
private Object readMark3(int b) throws IOException {
switch (b) {
case BufferWriter.DATE16:
return DateCache.getDate(readUInt16());
//return new java.sql.Date(BufferWriter.BASEDATE + readUInt16() * 86400000L);
case BufferWriter.DATE32:
return new java.sql.Date(BufferWriter.BASEDATE - readULong32() * 1000L);
case BufferWriter.DATETIME32:
return new java.sql.Timestamp(readULong32() * 1000L);
case BufferWriter.DATETIME33:
return new java.sql.Timestamp(readULong32() * -1000L);
case BufferWriter.DATETIME64:
return new java.sql.Timestamp(readLong64());
case BufferWriter.TIME16:
return new java.sql.Time(BufferWriter.BASETIME + readUInt16() * 1000);
case BufferWriter.TIME17:
return new java.sql.Time(BufferWriter.BASETIME + (0x10000 | readUInt16()) * 1000);
case BufferWriter.TIME32:
return new java.sql.Time(BufferWriter.BASETIME + readInt32());
case BufferWriter.DATE24:
return new java.sql.Date(BufferWriter.BASEDATE + readUInt24() * 86400000L);
default: // BufferWriter.DATE64
return new java.sql.Date(readLong64());
}
}
private void skipMark3(int b) throws IOException {
switch (b) {
case BufferWriter.DATE32:
case BufferWriter.DATETIME32:
case BufferWriter.DATETIME33:
case BufferWriter.TIME32:
skipFully(4);
break;
case BufferWriter.DATETIME64:
skipFully(8);
break;
case BufferWriter.DATE24:
skipFully(3);
break;
default: // BufferWriter.DATE16 BufferWriter.TIME16 BufferWriter.TIME17
skipFully(2);
}
}
public boolean isNone(Object obj) {
return obj == NONE;
}
private Object readFixedObject() throws IOException {
Object obj = readObject();
if (obj == null) {
skipFully(8);
} else {
skipFully(3);
}
return obj;
}
/**
* ??ȡһ??????
* @return
* @throws IOException
*/
public Object readObject() throws IOException {
int b = read2();
switch(b & 0xF0) {
case BufferWriter.MARK0:
return readMark0(b);
case BufferWriter.MARK1:
return readMark1(b);
case BufferWriter.MARK2:
return readMark2(b);
case BufferWriter.MARK3:
return readMark3(b);
case BufferWriter.INT4:
return INT15[b & 0x0F];
case BufferWriter.INT12:
return ObjectCache.getInteger(((b & 0x0F) << 8) + read2());
//return new Integer(((b & 0x0F) << 8) + read2());
case BufferWriter.STRING4:
case BufferWriter.STRING5:
return readString(b & 0x1F);
case BufferWriter.DIGIT4:
return readDigits(b & 0x0F);
case BufferWriter.HEX4:
return HEXSTRINGS[b & 0x0F];
case RowBufferWriter.FIXED64:
return readFixedObject();
case BufferWriter.SERIALBYTES:
int len = b & 0x0F;
if (len == 0) {
long v1 = readLong64();
long v2 = readLong64();
return new SerialBytes(v1, v2);
} else {
byte []bytes = new byte[len];
read(bytes);
return new SerialBytes(bytes, len);
}
default:
throw new RuntimeException();
}
}
/**
* ????һ??????
* @return
* @throws IOException
*/
public void skipObject() throws IOException {
int b = read2();
switch(b & 0xF0) {
case BufferWriter.MARK0:
break;
case BufferWriter.MARK1:
skipMark1(b);
break;
case BufferWriter.MARK2:
skipMark2(b);
break;
case BufferWriter.MARK3:
skipMark3(b);
break;
case BufferWriter.INT4:
break;
case BufferWriter.INT12:
skipFully(1);
break;
case BufferWriter.STRING4:
case BufferWriter.STRING5:
skipFully(b & 0x1F);
break;
case BufferWriter.DIGIT4:
skipFully(b & 0x0F);
break;
case BufferWriter.HEX4:
break;
case RowBufferWriter.FIXED64:
skipFully(8);
break;
case BufferWriter.SERIALBYTES:
int len = b & 0x0F;
if (len > 0) {
skipFully(len);
} else {
skipFully(16);
}
break;
default:
throw new RuntimeException();
}
}
private Record readRecord() throws IOException {
int id = readInt();
DataStruct ds = structManager.getDataStruct(id);
int fcount = ds.getFieldCount();
Object []vals = new Object[fcount];
for (int f = 0; f < fcount; ++f) {
vals[f] = readObject();
}
return new Record(ds, vals);
}
private Table readTable() throws IOException {
int id = readInt();
int len = readInt();
DataStruct ds = structManager.getDataStruct(id);
int fcount = ds.getFieldCount();
Object []vals = new Object[fcount];
Table table = new Table(ds, len);
for (int i = 1; i <= len; ++i) {
for (int f = 0; f < fcount; ++f) {
vals[f] = readObject();
}
table.newLast(vals);
}
return table;
}
private void skipTable() throws IOException {
int fcount = readInt();
for (int i = 0; i < fcount; ++i) {
readString(); // ?????ֶ???
}
int len = readInt();
for (int i = 1; i <= len; ++i) {
for (int f = 0; f < fcount; ++f) {
skipObject();
}
}
}
/**
* ???ص?ǰ?????Ļ???????λ??
* @return
*/
public int getCurPos() {
return index;
}
}
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